The Effect of Shoe Weight on Lower Extremities Joint Moment during Walking Swing Phase in Healthy Adults

Background: The overlooked factor wich significantly affect the loading pattern of lower extremity is shoe weight. Whilst evidence for the effects on the lower limb joint moments is becoming comprehensive, there is a paucity of information for any effects of it in swing phase of gait.Aim: to investigate the effect of shoe weight on lower extremity joint moments in healthy adults.Methods: hip, knee and ankle joint moments in swing phase of 20 healthy adult( mean age 33.1 years ±8.4, height 1.71 m ± 0.04 m, body mass 68.9 kg ± 12.1) in 2 randomly condition (1) control shoe (2) shoe which is weighted 50% of the control one was collected. Kinematic data and ground reaction force was collected using 12 cameras (100Hz) (Qualisys motion capture systems, Sweden). Joint moment data were calculated in Visual 3D, normalized to body mass and the peak and integral of internal moments derived. Moment integrals might better reflect total muscle effort than peak moment values.Results: Integral moment in sagittal plane of all three joint were reduced by the weighted shoe although in the ankle was not statistically significant (p<0.05) .joint acceleration increased in sagittal plane of ankle, knee and hip also increased.Conclusion: Since the participants in the study were blinded and also wear shoes for the first time Therefore, it is likely that in both condition, the force exerted by the muscles remains constant. On the other hand, considering the direction of the weight of the shoe, which is opposite to the force of the muscles, and also negatively applied, the forces which generated the torque were reduced.

Keywords:

shoe , swing phase , moment